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    <p>Sorry to say this, but none of your regexes are going to work. Remember that regular expressions are designed to match textual data. While it's possible to use them to match numbers, it's not really the tool of choice.</p> <p>If you <em>have</em> to use a regex, you need to think of the possible <em>textual</em> representations of a number range. </p> <p>For your <strong>example 1</strong>, that would be:</p> <ol> <li>either a single digit</li> <li>or a digit between 1 and 3, followed by any digit</li> <li>or a 4, followed by a digit between 0 and 5.</li> </ol> <p>As a regex:</p> <pre><code>^(?:\d|[1-3]\d|4[0-5])$ </code></pre> <p>The <code>^</code> and <code>$</code> anchors make sure that the entire string is evaluated; the <code>(?:...)</code> groups the alternation and "shields" it from the anchors.</p> <p>For your <strong>example 3</strong>:</p> <ol> <li>either a 1, followed by 6-9</li> <li>or a 2-5, followed by any digit</li> <li>or a 6, followed by 0-5</li> </ol> <p>As a regex:</p> <pre><code>^(?:1[6-9]|[2-5]\d|6[0-5])$ </code></pre> <p>For your <strong>example 5</strong>:</p> <ol> <li>1-5 digits</li> <li>or a 1, followed by 0-4, followed by any four digits</li> <li>or 150000.</li> </ol> <p>As a regex:</p> <pre><code>^(?:\d{1,5}|1[0-4]\d{4}|150000)$ </code></pre> <p>And so on. </p> <p>Adding decimal places is not very difficult:</p> <ul> <li><code>\.\d{2}</code> works for exactly two decimal places</li> <li><code>\.\d{1,3}</code> for 1 to 3 decimal places</li> <li>and <code>(?:\.\d{1,2})</code> for 0 to 2 decimal places (and the dot is only allowed if at least one digit follows).</li> </ul>
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    1. COThanks very much. I have modified some of my controls to now use range validators with the type set as integer for examples 1,3 and 5. One of the main reasons for asking was to try and understand how to limit the number of decimal places for an input, i.e. examples 2, 4 and 6 above. Thanks again. Martin
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    2. COI have added a paragraph about decimal places, too. By the way, you now have enough rep to upvote helpful answers (and you also can mark an answer as accepted). Hint, hint :)
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    3. COThanks, that's just what I need. I will modify the remaining controls to use regular expressions and leave the rest as range validators. Thanks again
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